Valid:
c-r-9-i8-5
cry-9-pto-5
cry-9
pto-9
cry-9-pto
c-pto
c9-pto
c-c-c
cry-c-pto
cr-y-pt
c-y-p
c-yy-p
cc-y-p
c-y-pp
aa-a-a
a-a
aaa-a
aaa-a-a
aaa-a-aa
aa-a-aa
a-a-aa
aa-a-a
aa-aa-aa
aaaaa-a-aa
a-b
a-bb
cryptosharon
cryptosharon9
cry.pto9
c-r.y-p.t-o9
cry-9-pto-5
s-h-a-r-o-n9
a12.b-3

Invalid:
CryptoSharon
9cryptosharon
9sh.aron
sha.9ron
sh--aron
crptshrn-
otp-.yrc